Filter discussion activity list for duplicates

Currently this just removes any duplicate discussion description edited
events from the view. Fixes #649
Merge branch 'master' of github.com:loomio/loomio into filter-discussion-activity-list
Add metrics tracking

Use Emil Stenstrom's lazy-load script

Pass server data to the javascript

Avoid caching of the metrics script with a uid

Include metrics script only for prod and staging
fixes #823 makes discusssion disappear instantly
Merge pull request #826 from loomio/bug/discussions-show-up-after-delete

fixes #823 makes discusssion disappear instantly
Merge pull request #813 from loomio/filter-discussion-activity-list

Filter discussion activity list for duplicates
Merge pull request #733 from loomio/feature/loomio-metrics

Feature/loomio metrics
add changes to improve admin
Implement public groups directory
Merge pull request #819 from loomio/feature/public-groups-directory

add feature to view publicly viewable groups
Merge pull request #820 from loomio/feature/admin-changes

add changes to improve admin
Deliver email in user's prefered language
Merge pull request #773 from loomio/deliver-translated-mail

Deliver email in user's prefered language
Add metrics javascript tracker to precompile list
remove groups link from homepage
Fix failing cuke
Use https for metrics collector script
Disable metrics tracker for now
fix spelling mistake that broke admin panel
Improve public groups directory